EP1839083A1 - Device for homogenizing light - Google Patents

Device for homogenizing light

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Publication number
EP1839083A1
EP1839083A1 EP05700754A EP05700754A EP1839083A1 EP 1839083 A1 EP1839083 A1 EP 1839083A1 EP 05700754 A EP05700754 A EP 05700754A EP 05700754 A EP05700754 A EP 05700754A EP 1839083 A1 EP1839083 A1 EP 1839083A1
Authority
EP
European Patent Office
Prior art keywords
cylindrical
lens array
cylindrical lens
lenses
cylindrical lenses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05700754A
Other languages
German (de)
French (fr)
Other versions
EP1839083B1 (en
Inventor
Heiko Ganser
Wieland Hill
Mikhail Petrov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Focuslight Germany GmbH
Original Assignee
Limo Patentverwaltung GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Limo Patentverwaltung GmbH and Co KG filed Critical Limo Patentverwaltung GmbH and Co KG
Publication of EP1839083A1 publication Critical patent/EP1839083A1/en
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G02B27/0966—Cylindrical lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G02B27/0961—Lens arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0977—Reflective elements
    • G02B27/0983—Reflective elements being curved

Definitions

  • the present invention relates to a device for homogenizing light, comprising a first cylindrical lens array through which light to be homogenized can pass, wherein the first cylindrical lens array has convex and concave cylindrical lenses with cylinder axes parallel to each other, which are arranged alternately side by side, and further comprising a second cylindrical lens array through which the light transmitted through the first cylindrical lens array can pass, the second cylindrical lens array having convex and concave cylindrical lenses with cylinder axes parallel to each other alternately juxtaposed, and the cylinder axes of the cylindrical lenses of the second cylindrical lens array parallel to the cylinder axes of the cylindrical lenses of the first cylindrical array Cylindrical lens arrays are aligned. Furthermore, the present invention relates to a device according to the preamble of claim 16.
  • the concave cylindrical lenses may be only depressions or approximately flat regions in the space between two convex cylindrical lenses.
  • Devices of the aforementioned type are known. Such devices are used, for example, to homogenize comparatively inhomogeneous light as emanating, for example, from an excimer laser or from a laser diode bar.
  • Fig. 1 shows schematically the working principle of such homogenizing.
  • the first cylindrical lens array 1 is arranged on a first substrate 2 and the second cylindrical lens array 3 is arranged on a second substrate 4, wherein the substrates 2, 4 are spaced apart from one another.
  • Impact on the device inhomogeneous Light 5 is homogenized by the device in that the light is distributed homogeneously over an angular range of the light field 6 emerging from the device from the individual cylindrical lenses of the cylindrical lens arrays 1, 3.
  • the homogeneous angular distribution in the emerging light field 6 can be converted into a correspondingly homogeneous spatial distribution in a working plane.
  • the focal length of the convex cylindrical lenses of the second cylindrical lens array 3 correspond approximately to the distance between the first and the second cylindrical lens array. In this way, the convex cylindrical lenses of the second cylindrical lens array will image a plane perpendicular to the propagation direction of the incident inhomogeneous light 5 in the region of the first cylindrical lens array into a working plane.
  • FIG. 2 shows in detail how incoming inhomogeneous light 5 passes through convex and concave cylindrical lenses 7, 8 of the first cylindrical lens array 1 and convex and concave cylindrical lenses 9, 10 of the second cylindrical lens array 2.
  • FIG. 2 shows in particular a partial beam 1 1, 12 extending in the left-hand image area and in the right-hand image area. These partial beams 1 1, 12 of the light 5 to be homogenized pass through two concave cylindrical lenses 8 of the first cylindrical lens array. It can be seen that the partial beams 1 1, 12 are deflected by the concave cylindrical lenses 8 to a large extent on a convex cylindrical lens 9 of the second cylindrical lens array 2. From this convex cylindrical lens 9, the imaged partial beams 1 1, 12 are deflected at an angle such that they overlap with a field lens in the outer lateral areas of a lighted area in a working plane.
  • FIG. 3 the intensity in a work plane is plotted against a location coordinate or even against an angle coordinate.
  • the light distribution shown in FIG. 3 has a central substantially homogeneous region 13 and two end elevations 14, which are essentially caused by the abovementioned partial beams 11, 12 or by further corresponding partial beams which are transmitted through the concave cylindrical lenses 8 of the first cylindrical lens array 1 passed through.
  • An explanation for this contribution is that the concave cylindrical lenses 8 of the first cylindrical lens array 1 have a very small radius and therefore a focal length, which is also very small.
  • the virtual focal points of the concave cylindrical lenses 8 are approximately in the plane of the first cylindrical lens array 1 and are imaged by the convex cylindrical lenses 9 of the second cylindrical lens array 2 in the working plane.
  • the problem underlying the present invention is the provision of a device of the type mentioned, which can produce a more homogeneous light distribution in a working plane.
  • the concave cylindrical lenses of the first cylindrical lens array in the direction in which the cylindrical lenses are arranged side by side have a different design than the concave cylindrical lenses of the second cylindrical lens array in the direction in which the cylindrical lenses are arranged side by side.
  • the elevations shown in FIG. 3 can be avoided.
  • the concave cylindrical lenses of the second cylindrical lens array in the direction in which the cylindrical lenses are arranged side by side larger, preferably substantially larger than the concave cylindrical lenses of the first cylindrical lens array.
  • the concave cylindrical lenses of the second cylindrical lens array in this direction may be at least about twice as large as the concave cylindrical lenses of the first cylindrical lens array.
  • the convex cylindrical lenses of the first cylindrical lens array in the direction in which the cylindrical lenses are arranged side by side, larger, in particular by a multiple greater than the concave cylindrical lenses of the first cylindrical lens array.
  • the concave cylindrical lenses can only represent depressions or almost flat regions between the convex cylindrical lenses of the first cylindrical lens array.
  • the focal length of the convex cylindrical lenses of the second cylindrical lens array is approximately the same as the distance between the first cylindrical lens array and the second cylindrical lens array. In this way, an image of the plane of the first cylindrical lens array is achieved in the working plane by the convex cylindrical lenses of the second cylindrical lens array.
  • the focal length of the concave cylindrical lenses of the first cylindrical lens array is substantially greater than the focal length of the convex cylindrical lenses of the second cylindrical lens array.
  • the virtual focal points of the concave cylindrical lenses of the first cylindrical lens array are comparatively far from the focal plane of the focal plane second cylindrical lens arrays are removed, so that these focal points are not sharply imaged by the convex cylindrical lenses of the second cylindrical lens array in the working plane.
  • the concave cylindrical lenses of the first cylindrical lens array in the direction in which the cylindrical lenses are arranged next to one another have approximately the same extent as the convex cylindrical lenses of the first cylindrical lens array in the direction in which the cylindrical lenses are arranged next to one another.
  • the focal points of the concave cylindrical lenses can be significantly removed from the plane of the first cylindrical lens array.
  • the device comprises a substrate on which the first cylindrical lens array and the second cylindrical lens array are arranged on opposite sides.
  • This substrate can then have a corresponding thickness, so that the first cylindrical lens array at the distance of the focal length of the convex cylindrical lenses of the second cylindrical lens array is removed therefrom.
  • the device comprises a first substrate and a second, different from the first, in particular spaced from the first substrate substrate wherein the first cylindrical lens array is disposed on the first substrate and the second cylindrical lens array is disposed on the second substrate.
  • the distance between the substrates can then be adjusted so that the distance between the first and second cylindrical lens array corresponds to the focal length of the convex cylindrical lenses of the second cylindrical lens array.
  • the device comprises a third cylindrical lens array which is arranged on the side opposite the first cylindrical lens array side of the first substrate and convex and concave cylindrical lenses with mutually parallel cylinder axes, which are arranged alternately side by side, wherein the cylinder axes the cylindrical lenses of the first cylindrical lens array are arranged perpendicular to the cylinder axes of the cylindrical lenses of the third cylindrical lens array.
  • the device further comprises a fourth cylindrical lens array, which is arranged on the side opposite the second cylindrical lens array side of the second substrate and convex and concave cylindrical lenses having mutually parallel cylinder axes, which are arranged alternately side by side, wherein the cylinder axes the cylindrical lenses of the second cylindrical lens array are arranged perpendicular to the cylinder axes of the cylindrical lenses of the fourth cylindrical lens array. Homogenization of the light to be homogenized in a direction which is perpendicular to the direction in which the first and second cylindrical lens arrays contribute to a homogenization can be effected by the third and possibly fourth cylindrical lens arrays.
  • the third and fourth cylindrical lens arrays be formed corresponding to the first and second cylindrical lens arrays, in particular with respect to the widths of the concave cylindrical lenses of the third and fourth cylindrical lens array. Furthermore, the spacing of the third from the fourth cylindrical lens array can also essentially correspond to the focal length of the convex cylindrical lenses of the third cylindrical lens array.
  • the concave cylindrical mirror of the first cylindrical mirror array in the direction in which the cylindrical mirrors are arranged side by side a different design, in particular a different extent and / or a different curvature than the concave cylindrical mirror of the second cylindrical mirror array in the Direction in which the cylinder mirrors are arranged side by side.
  • the device according to claim 16 is further developed by corresponding features that have been set forth in claims 2 to 15 for the cylindrical lens arrays.
  • the focal points of the concave cylindrical mirrors of the first cylindrical mirror array can be comparatively far removed from the plane of the first cylindrical mirror array.
  • the concave cylindrical mirror of the second cylindrical mirror array can be larger, in particular significantly larger than the concave cylindrical mirror of the first cylindrical mirror array.
  • the distance of the first cylindrical mirror array from the second cylindrical mirror array corresponds approximately to the focal length of the convex cylindrical mirror of the second cylindrical mirror array.
  • third and / or fourth cylindrical mirror arrays may also be present Cylindrical mirror having cylinder axes, which are aligned perpendicular to the cylinder axes of the cylinder mirror of the first and second cylindrical mirror array.
  • Fig. 1 shows schematically the working principle of a device for the homogenization of light
  • Fig. 2 is a schematic side view of a device for homogenization according to the prior art
  • FIG. 3 is a schematic view of a light distribution in a working plane, which is produced by a device for homogenization according to FIG. 2;
  • FIG. 4 shows schematically a detail of a first embodiment of a device according to the invention
  • Fig. 5 shows schematically a section of a second
  • the first embodiment of a device according to the invention shown in FIG. 4 comprises a first substrate 15 and a second substrate 16.
  • the first substrate 15 has on its entrance surface a first cylindrical lens array 17, whereas the exit surface is flat.
  • the exit surface is also with a cylindrical lens array, which is aligned, for example, crossed to the first cylindrical lens array 17.
  • the first Cylindrical lens array 17 has convex cylindrical lenses 18 and concave cylindrical lenses 19, which are arranged alternately side by side. In the embodiment shown in Fig. 4, only two concave cylindrical lenses 19 and a convex cylindrical lens 18 are indicated. However, a multiplicity of convex and concave cylindrical lenses 18, 19 can be arranged side by side in the X direction next to each other.
  • the concave cylindrical lenses 19 are in the X direction, that is, in the direction in which the cylindrical lenses 18, 19 are arranged side by side, significantly less expanded than the convex cylindrical lenses 18th
  • the second substrate 16 has on its entrance surface, that is to say on its side facing the first substrate 15, a second cylindrical lens array 20 with convex cylindrical lenses 21 and concave cylindrical lenses 22.
  • the convex and concave cylindrical lenses 21, 22 are arranged alternately next to one another in the X direction, whereby a multiplicity of convex and concave cylindrical lenses 21, 22 can likewise be provided on the entry surface of the substrate 16. From Fig.
  • the exit surface of the second substrate 16 is also designed plan.
  • the exit surface of the second substrate 16 could also be provided with a further cylindrical lens array, in which the cylinder axes of the cylindrical lenses could be aligned perpendicular to the cylinder axes of the cylindrical lenses 21, 22 of the second cylindrical lens array 20. From FIG.
  • the concave cylindrical lenses 22 of the second cylindrical lens array 20 in the X direction ie in the direction in which the cylindrical lenses 18, 19, 21, 22 are arranged next to one another, are significantly larger than the concave cylindrical lenses 19
  • the concave cylindrical lenses 22 of the second cylindrical lens array 20 in this exemplary embodiment are approximately twice as wide as the concave cylindrical lenses 19 of the first cylindrical lens array 17.
  • partial beams 23, 24 of the light 25 to be homogenized are further drawn, which pass through the concave cylindrical lenses 19 of the first cylindrical lens array 17.
  • the partial beams 23, 24 do not or only to an insignificant extent through the convex cylindrical lenses 21 of the second cylindrical lens array 20, but through the widened concave cylindrical lenses 22 of the second cylindrical lens array.
  • the partial beams 23, 24 are deflected by the concave cylindrical lenses 22 of the second cylindrical lens array 20 such that they are distributed in the working plane over a wide range, in particular over the entire width of the homogenized light field. In this way, the apparent from Fig. 3 lateral elevations 14 are avoided according to the prior art.
  • the second embodiment of a device according to the invention shown in FIG. 5 also comprises a first substrate 26 and a second substrate 27.
  • the first substrate 26 has on its entrance surface a first cylindrical lens array 28 with convex cylindrical lenses 29 and concave cylindrical lenses 30.
  • the second substrate 27 has on its entrance surface, that is to say on its side facing the first substrate 26, a second cylindrical lens array 31 with convex cylindrical lenses 32 and concave cylindrical lenses 33 on.
  • the concave cylindrical lenses 30 of the first cylindrical lens array 28 in the X direction ie in the direction in which the cylindrical lenses 29, 30 are arranged alternately next to one another, are approximately equal
  • the concave cylindrical lenses 33 of the second cylindrical lens array 31 are significantly smaller than the convex cylindrical lenses 32 of the second cylindrical lens array 31.
  • the focal length f 1 k of the concave cylindrical lenses 30 of the first cylindrical lens array 28 is comparatively large, that is in particular approximately twice as large as the height or the extent of the convex Cylindrical lenses 29 in the propagation direction Z of the light to be homogenized.
  • the focal length hv of the convex cylindrical lenses 32 of the second cylindrical lens array 31 is also shown for clarification.
  • FIG. 5 shows that this focal length f 2v of the convex cylindrical lenses 32 corresponds approximately to the distance between the first cylindrical lens array 28 and the second cylindrical lens array 31.
  • the virtual focal point 34 of the concave cylindrical lenses 30 of the convex cylindrical lenses 32 of the second cylindrical lens array 31 does not become schematically indicated in FIG. 5 mapped to the work plane. This is illustrated in FIG. 5 by partial beams 35, 36, 37 shown by way of example.
  • the apex lines of the convex cylindrical lenses 18, 29 of the first cylindrical lens array 17, 28 are aligned with the apex lines of the convex cylindrical lenses 21, 32 of the second cylindrical lens array 20, 31. Furthermore, the apex lines of the concave cylindrical lenses 19, 30 of the first cylindrical lens array 17, 28 are aligned with the apex lines of the concave cylindrical lenses 22, 33 of the second cylindrical lens array 20, 31.

Abstract

A device for homogenizing light has at least two cylindrical lens arrays which are placed one behind the other in a direction of diffusion of the light to be homogenized and which each have convex and concave cylindrical lenses disposed next to one another in an alternating manner, the cylinder axes of these cylindrical lenses are aligned parallel to one another. In the direction, in which the cylindrical lenses are disposed next to one another, the concave cylindrical lenses of the first cylindrical lens array have a shaping, in particular, an extension or curvature different from that of the concave cylindrical lenses of the second cylindrical lens arrays.

Description

"Vorrichtung zur Homogenisierung von Licht" "Apparatus for the homogenization of light"
Die vorliegende Erfindung betrifft eine Vorrichtung zur Homogenisierung von Licht, umfassend ein erstes Zylinderlinsenarray, durch das zu homogenisierende Licht hindurchtreten kann, wobei das erste Zylinderlinsenarray konvexe und konkave Zylinderlinsen mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, sowie weiterhin umfassend ein zweites Zylinderlinsenarray, durch das das durch das erste Zylinderlinsenarray hindurchgetretene Licht hindurchtreten kann, wobei das zweite Zylinderlinsenarray konvexe und konkave Zylinderlinsen mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, und wobei die Zylinderachsen der Zylinderlinsen des zweiten Zylinderlinsenarrays parallel zu den Zylinderachsen der Zylinderlinsen des ersten Zylinderlinsenarrays ausgerichtet sind. Weiterhin betrifft die vorliegende Erfindung eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 16.The present invention relates to a device for homogenizing light, comprising a first cylindrical lens array through which light to be homogenized can pass, wherein the first cylindrical lens array has convex and concave cylindrical lenses with cylinder axes parallel to each other, which are arranged alternately side by side, and further comprising a second cylindrical lens array through which the light transmitted through the first cylindrical lens array can pass, the second cylindrical lens array having convex and concave cylindrical lenses with cylinder axes parallel to each other alternately juxtaposed, and the cylinder axes of the cylindrical lenses of the second cylindrical lens array parallel to the cylinder axes of the cylindrical lenses of the first cylindrical array Cylindrical lens arrays are aligned. Furthermore, the present invention relates to a device according to the preamble of claim 16.
Von der vorgenannten Vorrichtung sollen auch Zylinderlinsenarrays mit konkaven Zylinderlinsen umfasst sein, die deutlich kleiner sind als die zu ihnen benachbarten konvexen Zylinderlinsen. Beispielsweise können die konkaven Zylinderlinsen lediglich Vertiefungen oder annähernd flache Bereiche in dem Zwischenraum zwischen zwei konvexen Zylinderlinsen sein. Vorrichtungen der vorgenannten Art sind bekannt. Derartige Vorrichtungen werden beispielsweise dazu verwendet, vergleichsweise inhomogenes Licht wie es beispielsweise von einenvExcimer-Laser oder von einem Laserdiodenbarren ausgeht, zu homogenisieren. Fig. 1 zeigt schematisch das Arbeitsprinzip derartiger Homogenisiervorrichtungen. Bei der darin abgebildeten Vorrichtung ist das erste Zylinderlinsenarray 1 auf einem ersten Substrat 2 und das zweite Zylinderlinsenarray 3 auf einem zweiten Substrat 4 angeordnet, wobei die Substrate 2, 4 voneinander beabstandet sind. Auf die Vorrichtung auftreffendes inhomogenes Licht 5 wird von der Vorrichtung dadurch homogenisiert, dass von den einzelnen Zylinderlinsen der Zylinderlinsenarrays 1 , 3 das Licht homogen über einen Winkelbereich des aus der Vorrichtung austretenden Lichtfeldes 6 verteilt wird. Durch eine hinter dem zweiten Substrat 4 angeordnete Feldlinse kann die homogene Winkelverteilung in dem austretenden Lichtfeld 6 in eine entsprechend homogene Ortsverteilung in einer Arbeitsebene umgewandelt werden.Cylindrical lens arrays with concave cylindrical lenses, which are significantly smaller than the convex cylindrical lenses adjacent to them, should also be included in the aforementioned device. For example, the concave cylindrical lenses may be only depressions or approximately flat regions in the space between two convex cylindrical lenses. Devices of the aforementioned type are known. Such devices are used, for example, to homogenize comparatively inhomogeneous light as emanating, for example, from an excimer laser or from a laser diode bar. Fig. 1 shows schematically the working principle of such homogenizing. In the device depicted therein, the first cylindrical lens array 1 is arranged on a first substrate 2 and the second cylindrical lens array 3 is arranged on a second substrate 4, wherein the substrates 2, 4 are spaced apart from one another. Impact on the device inhomogeneous Light 5 is homogenized by the device in that the light is distributed homogeneously over an angular range of the light field 6 emerging from the device from the individual cylindrical lenses of the cylindrical lens arrays 1, 3. By means of a field lens arranged behind the second substrate 4, the homogeneous angular distribution in the emerging light field 6 can be converted into a correspondingly homogeneous spatial distribution in a working plane.
Bei Vorrichtungen der eingangs genannten Art wird in der Regel die Brennweite der konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays 3 etwa dem Abstand zwischen dem ersten und dem zweiten Zylinderlinsenarray entsprechen. Auf diese Weise werden die konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays eine Ebene senkrecht zur Ausbreitungsrichtung des einfallenden inhomogenen Lichtes 5 im Bereich des ersten Zylinderlinsenarrays in eine Arbeitsebene abbilden.In devices of the type mentioned in the rule, the focal length of the convex cylindrical lenses of the second cylindrical lens array 3 correspond approximately to the distance between the first and the second cylindrical lens array. In this way, the convex cylindrical lenses of the second cylindrical lens array will image a plane perpendicular to the propagation direction of the incident inhomogeneous light 5 in the region of the first cylindrical lens array into a working plane.
Fig. 2 zeigt detailliert, wie einfallendes inhomogenes Licht 5 durch konvexe und konkave Zylinderlinsen 7, 8 des ersten Zylinderlinsenarrays 1 und konvexe und konkave Zylinderlinsen 9, 10 des zweiten Zylinderlinsenarrays 2 hindurchverläuft. In Fig. 2 sind insbesondere ein im linken Bildbereich und ein im rechten Bildbereich verlaufender Teilstrahl 1 1 , 12 abgebildet. Diese Teilstrahlen 1 1 , 12 des zu homogenisierenden Lichtes 5 treten durch zwei konkave Zylinderlinsen 8 des ersten Zylinderlinsenarrays hindurch. Es ist ersichtlich, dass die Teilstrahlen 1 1 , 12 durch die konkaven Zylinderlinsen 8 zu einem großen Teil auf eine konvexe Zylinderlinse 9 des zweiten Zylinderlinsenarrays 2 abgelenkt werden. Von dieser konvexen Zylinderlinse 9 werden die abgebildeten Teilstrahlen 1 1 , 12 unter einem derartigen Winkel abgelenkt, dass sie bei Überlagerung mit einer Feldlinse in die äußeren seitlichen Bereiche eines ausgeleuchteten Bereiches in einer Arbeitsebene gelangen.2 shows in detail how incoming inhomogeneous light 5 passes through convex and concave cylindrical lenses 7, 8 of the first cylindrical lens array 1 and convex and concave cylindrical lenses 9, 10 of the second cylindrical lens array 2. FIG. 2 shows in particular a partial beam 1 1, 12 extending in the left-hand image area and in the right-hand image area. These partial beams 1 1, 12 of the light 5 to be homogenized pass through two concave cylindrical lenses 8 of the first cylindrical lens array. It can be seen that the partial beams 1 1, 12 are deflected by the concave cylindrical lenses 8 to a large extent on a convex cylindrical lens 9 of the second cylindrical lens array 2. From this convex cylindrical lens 9, the imaged partial beams 1 1, 12 are deflected at an angle such that they overlap with a field lens in the outer lateral areas of a lighted area in a working plane.
Diese Situation ist in Fig. 3 schematisch verdeutlicht. In Fig. 3 ist die Intensität in einer Arbeitsebene gegen eine Ortskoordinate oder auch gegen eine Winkelkoordinate aufgetragen. Die in Fig. 3 abgebildete Lichtverteilung weist einen mittleren im Wesentlichen homogenen Bereich 13 sowie zwei endseitige Überhöhungen 14 auf, die im Wesentlichen durch die vorgenannten Teilstrahlen 1 1 , 12 beziehungsweise durch weitere entsprechende Teilstrahlen hervorgerufen werden, die durch die konkaven Zylinderlinsen 8 des ersten Zylinderlinsenarrays 1 hindurchgetreten sind. Eine Erklärung für diesen Beitrag ist darin zu sehen, dass die konkaven Zylinderlinsen 8 des ersten Zylinderlinsenarrays 1 einen sehr kleinen Radius und damit eine Brennweite aufweisen, die ebenfalls sehr klein ist. Dadurch liegen die virtuellen Brennpunkte der konkaven Zylinderlinsen 8 etwa in der Ebene des ersten Zylinderlinsenarrays 1 und werden von den konvexen Zylinderlinsen 9 des zweiten Zylinderlinsenarrays 2 in die Arbeitsebene abgebildet.This situation is illustrated schematically in FIG. In FIG. 3, the intensity in a work plane is plotted against a location coordinate or even against an angle coordinate. The light distribution shown in FIG. 3 has a central substantially homogeneous region 13 and two end elevations 14, which are essentially caused by the abovementioned partial beams 11, 12 or by further corresponding partial beams which are transmitted through the concave cylindrical lenses 8 of the first cylindrical lens array 1 passed through. An explanation for this contribution is that the concave cylindrical lenses 8 of the first cylindrical lens array 1 have a very small radius and therefore a focal length, which is also very small. As a result, the virtual focal points of the concave cylindrical lenses 8 are approximately in the plane of the first cylindrical lens array 1 and are imaged by the convex cylindrical lenses 9 of the second cylindrical lens array 2 in the working plane.
Die aus Fig. 3 ersichtlichen und für den Stand der Technik typischen Überhöhungen 14 sind für eine ganze Reihe von Anwendungen störend.The apparent from Fig. 3 and typical for the prior art elevations 14 are disturbing for a number of applications.
Das der vorliegenden Erfindung zugrunde liegende Problem ist die Schaffung einer Vorrichtung der eingangs genannten Art, die eine homogenere Lichtverteilung in einer Arbeitsebene erzeugen kann.The problem underlying the present invention is the provision of a device of the type mentioned, which can produce a more homogeneous light distribution in a working plane.
Dies wird erfindungsgemäß durch eine Vorrichtung der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 1 oder des Anspruchs 16 erreicht. Die Unteransprüche betreffen bevorzugte Weiterbildungen der Erfindung. -A-This is inventively achieved by a device of the type mentioned above with the characterizing features of claim 1 or claim 16. The subclaims relate to preferred developments of the invention. -A-
Gemäß Anspruch 1 ist vorgesehen, dass die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays in der Richtung, in der die Zylinderlinsen nebeneinander angeordnet sind, eine andere Gestaltung aufweisen als die konkaven Zylinderlinsen des zweiten Zylinderlinsenarrays in der Richtung, in der die Zylinderlinsen nebeneinander angeordnet sind. Beispielsweise durch die gezielte Veränderung der Ausdehnung und/oder der Krümmung der konkaven Zylinderlinsen des ersten und/oder des zweiten Zylinderlinsenarrays können die aus Fig. 3 ersichtlichen Überhöhungen vermieden werden.According to claim 1 it is provided that the concave cylindrical lenses of the first cylindrical lens array in the direction in which the cylindrical lenses are arranged side by side, have a different design than the concave cylindrical lenses of the second cylindrical lens array in the direction in which the cylindrical lenses are arranged side by side. For example, by deliberately changing the extent and / or the curvature of the concave cylindrical lenses of the first and / or the second cylindrical lens array, the elevations shown in FIG. 3 can be avoided.
Dabei kann beispielsweise vorgesehen sein, dass die konkaven Zylinderlinsen des zweiten Zylinderlinsenarrays in der Richtung, in der die Zylinderlinsen nebeneinander angeordnet sind, größer, vorzugsweise wesentlich größer als die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays sind. Beispielsweise können die konkaven Zylinderlinsen des zweiten Zylinderlinsenarrays in dieser Richtung mindestens etwa doppelt so groß wie die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays sein. Durch eine Vergrößerung der konkaven Zylinderlinsen des zweiten Zylinderlinsenarrays kann zumindest teilweise vermieden werden, dass die durch die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays hindurchgetretenen Teilstrahlen auf konvexe Zylinderlinsen des zweiten Zylinderlinsenarrays auftreffen. Damit können aber diese durch die konkaven Zylinderlinsen des ersten Zylinderlinsenarray hindurchgetretenen Teilstrahlen nicht mehr von den konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays in die seitlichen Bereiche des Lichtfeldes in der Arbeitsebene abgelenkt beziehungsweise abgebildet werden. Dadurch fallen die Überhöhungen weg. Dadurch wird der aus Fig. 3 ersichtliche homogene Bereich 13 vergrößert. Insbesondere wird aufgrund der Tatsache, dass die durch die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays hindurchgetretenen Teilstrahlen durch die konkaven Zylinderlinsen des zweiten Zylinderlinsenarrays hindurchtreten, erreicht, dass diese Teilstrahlen im Wesentlichen über die gesamte Breite des homogenisierten Lichtfeldes in der Arbeitsebene verteilt werden. Auf diese Weise wird die Effizienz der Vorrichtung (die Lichtmenge im homogenen Bereich beziehungsweise die Lichtmenge insgesamt) vergrößert.It can be provided, for example, that the concave cylindrical lenses of the second cylindrical lens array in the direction in which the cylindrical lenses are arranged side by side, larger, preferably substantially larger than the concave cylindrical lenses of the first cylindrical lens array. For example, the concave cylindrical lenses of the second cylindrical lens array in this direction may be at least about twice as large as the concave cylindrical lenses of the first cylindrical lens array. By enlarging the concave cylindrical lenses of the second cylindrical lens array, it can be at least partially avoided that the partial beams which have passed through the concave cylindrical lenses of the first cylindrical lens array impinge on convex cylindrical lenses of the second cylindrical lens array. However, these sub-beams which have passed through the concave cylindrical lenses of the first cylindrical lens array can no longer be deflected or imaged by the convex cylindrical lenses of the second cylindrical lens array into the lateral areas of the light field in the working plane. As a result, the excesses fall away. As a result, the homogeneous region 13 shown in FIG. 3 is increased. In particular, due to the fact that the through the concave cylindrical lenses of the first Cylindrical lens arrays penetrated part rays passing through the concave cylindrical lenses of the second cylindrical lens array, achieved that these partial beams are distributed over substantially the entire width of the homogenized light field in the working plane. In this way, the efficiency of the device (the amount of light in the homogeneous area or the total amount of light) is increased.
Es besteht weiterhin die Möglichkeit, dass die konvexen Zylinderlinsen des ersten Zylinderlinsenarrays, in der Richtung, in der die Zylinderlinsen nebeneinander angeordnet sind, größer, insbesondere um ein mehrfaches größer als die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays sind. Insbesondere können die konkaven Zylinderlinsen lediglich Vertiefungen oder beinahe flache Bereiche zwischen den konvexen Zylinderlinsen des ersten Zylinderlinsenarrays darstellen.There is also the possibility that the convex cylindrical lenses of the first cylindrical lens array, in the direction in which the cylindrical lenses are arranged side by side, larger, in particular by a multiple greater than the concave cylindrical lenses of the first cylindrical lens array. In particular, the concave cylindrical lenses can only represent depressions or almost flat regions between the convex cylindrical lenses of the first cylindrical lens array.
Wie im Stand der Technik besteht auch bei der vorliegenden Erfindung die Möglichkeit, dass die Brennweite der konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays etwa so groß ist wie der Abstand zwischen dem ersten Zylinderlinsenarray und dem zweiten Zylinderlinsenarray. Auf diese Weise wird durch die konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays eine Abbildung der Ebene des ersten Zylinderlinsenarrays in die Arbeitsebene erreicht.As in the prior art, the possibility exists in the present invention that the focal length of the convex cylindrical lenses of the second cylindrical lens array is approximately the same as the distance between the first cylindrical lens array and the second cylindrical lens array. In this way, an image of the plane of the first cylindrical lens array is achieved in the working plane by the convex cylindrical lenses of the second cylindrical lens array.
Gemäß einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung besteht die Möglichkeit, dass die Brennweite der konkaven Zylinderlinsen des ersten Zylinderlinsenarrays wesentlich größer ist als die Brennweite der konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays. Auf diese Weise kann erreicht werden, dass die virtuellen Brennpunkte der konkaven Zylinderlinsen des ersten Zylinderlinsenarrays vergleichsweise weit von der Brennebene des zweiten Zylinderlinsenarrays entfernt sind, so dass diese Brennpunkte nicht scharf von den konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays in die Arbeitsebene abgebildet werden. Auf diese Weise kann somit selbst bei vergleichsweise kleinen konkaven Zylinderlinsen des zweiten Zylinderlinsenarrays und somit selbst bei durch die konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays hindurchtretenden Teilstrahlen, die vorher durch die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays hindurchgetreten sind, erreicht werden, dass keine Überhöhungen in den seitlichen Bereichen der Lichtverteilung in der Arbeitsebene hervorgerufen werden.According to another preferred embodiment of the present invention, there is the possibility that the focal length of the concave cylindrical lenses of the first cylindrical lens array is substantially greater than the focal length of the convex cylindrical lenses of the second cylindrical lens array. In this way, it can be achieved that the virtual focal points of the concave cylindrical lenses of the first cylindrical lens array are comparatively far from the focal plane of the focal plane second cylindrical lens arrays are removed, so that these focal points are not sharply imaged by the convex cylindrical lenses of the second cylindrical lens array in the working plane. In this way, even with comparatively small concave cylindrical lenses of the second cylindrical lens array and thus even when passing through the convex cylindrical lenses of the second cylindrical lens array partial beams that have previously passed through the concave cylindrical lenses of the first cylindrical lens array, can be achieved that no elevations in the lateral areas the light distribution in the working plane are caused.
Es besteht insbesondere die Möglichkeit, dass die konkaven Zylinderlinsen des ersten Zylinderlinsenarrays in der Richtung, in der die Zylinderlinsen nebeneinander angeordnet sind, etwa die gleiche Ausdehnung aufweisen wie die konvexen Zylinderlinsen des ersten Zylinderlinsenarrays in der Richtung, in der die Zylinderlinsen nebeneinander angeordnet sind. Bei einer derartigen Anordnung können die Brennpunkte der konkaven Zylinderlinsen deutlich von der Ebene des ersten Zylinderlinsenarrays entfernt sein.In particular, there is the possibility that the concave cylindrical lenses of the first cylindrical lens array in the direction in which the cylindrical lenses are arranged next to one another have approximately the same extent as the convex cylindrical lenses of the first cylindrical lens array in the direction in which the cylindrical lenses are arranged next to one another. With such an arrangement, the focal points of the concave cylindrical lenses can be significantly removed from the plane of the first cylindrical lens array.
Es besteht die Möglichkeit, dass die Vorrichtung ein Substrat umfasst, auf dem das erste Zylinderlinsenarray und das zweite Zylinderlinsenarray auf einander gegenüberliegenden Seiten angeordnet sind. Dieses Substrat kann dann eine entsprechende Dicke aufweisen, so dass das erste Zylinderlinsenarray im Abstand der Brennweite der konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays von diesem entfernt ist.There is the possibility that the device comprises a substrate on which the first cylindrical lens array and the second cylindrical lens array are arranged on opposite sides. This substrate can then have a corresponding thickness, so that the first cylindrical lens array at the distance of the focal length of the convex cylindrical lenses of the second cylindrical lens array is removed therefrom.
Alternativ dazu besteht die Möglichkeit, dass die Vorrichtung ein erstes Substrat und ein zweites, von dem ersten unterschiedliches, insbesondere von dem ersten Substrat beabstandetes Substrat umfasst, wobei das erste Zylinderlinsenarray auf dem ersten Substrat und das zweite Zylinderlinsenarray auf dem zweiten Substrat angeordnet sind. Bei einer derartigen Vorrichtung kann dann der Abstand zwischen den Substraten angepasst werden, so dass der Abstand zwischen erstem und zweitem Zylinderlinsenarray der Brennweite der konvexen Zylinderlinsen des zweiten Zylinderlinsenarrays entspricht.Alternatively, there is the possibility that the device comprises a first substrate and a second, different from the first, in particular spaced from the first substrate substrate wherein the first cylindrical lens array is disposed on the first substrate and the second cylindrical lens array is disposed on the second substrate. In such a device, the distance between the substrates can then be adjusted so that the distance between the first and second cylindrical lens array corresponds to the focal length of the convex cylindrical lenses of the second cylindrical lens array.
Bei einer derartigen Vorrichtung besteht weiterhin die Möglichkeit, dass die Vorrichtung ein drittes Zylinderlinsenarray umfasst, dass auf der dem ersten Zylinderlinsenarray gegenüberliegenden Seite des ersten Substrats angeordnet ist und konvexe und konkave Zylinderlinsen mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, wobei die Zylinderachsen der Zylinderlinsen des ersten Zylinderlinsenarrays senkrecht zu den Zylinderachsen der Zylinderlinsen des dritten Zylinderlinsenarrays angeordnet sind.In such a device, there is also the possibility that the device comprises a third cylindrical lens array which is arranged on the side opposite the first cylindrical lens array side of the first substrate and convex and concave cylindrical lenses with mutually parallel cylinder axes, which are arranged alternately side by side, wherein the cylinder axes the cylindrical lenses of the first cylindrical lens array are arranged perpendicular to the cylinder axes of the cylindrical lenses of the third cylindrical lens array.
Alternativ oder zusätzlich dazu kann vorgesehen sein, dass die Vorrichtung weiterhin ein viertes Zylinderlinsenarray umfasst, das auf der dem zweiten Zylinderlinsenarray gegenüberliegenden Seite des zweiten Substrats angeordnet ist und konvexe und konkave Zylinderlinsen mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, wobei die Zylinderachsen der Zylinderlinsen des zweiten Zylinderlinsenarrays senkrecht zu den Zylinderachsen der Zylinderlinsen des vierten Zylinderlinsenarrays angeordnet sind. Durch die dritten und gegebenenfalls vierten Zylinderlinsenarrays kann eine Homogenisierung des zu homogenisierenden Lichtes in einer Richtung erfolgen, die senkrecht zu der Richtung ist, in der die ersten und zweiten Zylinderlinsenarrays zu einer Homogenisierung beitragen. Dazu können die dritten und vierten Zylinderlinsenarrays entsprechend den ersten und zweiten Zylinderlinsenarrays ausgebildet sein, insbesondere hinsichtlich der Breiten der konkaven Zylinderlinsen des dritten und vierten Zylinderlinsenarrays. Weiterhin kann auch der Abstand des dritten von dem vierten Zylinderlinsenarray im Wesentlichen der Brennweite der konvexen Zylinderlinsen des dritten Zylinderlinsenarrays entsprechen.Alternatively or additionally, it may be provided that the device further comprises a fourth cylindrical lens array, which is arranged on the side opposite the second cylindrical lens array side of the second substrate and convex and concave cylindrical lenses having mutually parallel cylinder axes, which are arranged alternately side by side, wherein the cylinder axes the cylindrical lenses of the second cylindrical lens array are arranged perpendicular to the cylinder axes of the cylindrical lenses of the fourth cylindrical lens array. Homogenization of the light to be homogenized in a direction which is perpendicular to the direction in which the first and second cylindrical lens arrays contribute to a homogenization can be effected by the third and possibly fourth cylindrical lens arrays. For this purpose, the third and fourth cylindrical lens arrays be formed corresponding to the first and second cylindrical lens arrays, in particular with respect to the widths of the concave cylindrical lenses of the third and fourth cylindrical lens array. Furthermore, the spacing of the third from the fourth cylindrical lens array can also essentially correspond to the focal length of the convex cylindrical lenses of the third cylindrical lens array.
Gemäß Anspruch 16 kann vorgesehen sein, dass die konkaven Zylinderspiegel des ersten Zylinderspiegelarrays in der Richtung, in der die Zylinderspiegel nebeneinander angeordnet sind, eine andere Gestaltung, insbesondere eine andere Ausdehnung und/oder eine andere Krümmung aufweisen als die konkaven Zylinderspiegel des zweiten Zylinderspiegelarrays in der Richtung, in der die Zylinderspiegel nebeneinander angeordnet sind. Durch diese Übertragung der Eigenschaften der Zylinderlinsenarrays gemäß den Ansprüchen 1 bis 15 auf Zylinderspiegelarrays werden letztlich die gleichen Vorteile erzielt.According to claim 16 it can be provided that the concave cylindrical mirror of the first cylindrical mirror array in the direction in which the cylindrical mirrors are arranged side by side, a different design, in particular a different extent and / or a different curvature than the concave cylindrical mirror of the second cylindrical mirror array in the Direction in which the cylinder mirrors are arranged side by side. By this transfer of the properties of the cylindrical lens arrays according to claims 1 to 15 on cylindrical mirror arrays ultimately the same advantages are achieved.
Insbesondere besteht die Möglichkeit, dass die Vorrichtung gemäß Anspruch 16 durch entsprechende Merkmale weitergebildet wird, die in den Ansprüchen 2 bis 15 für die Zylinderlinsenarrays dargelegt wurden. Insbesondere können somit die Brennpunkte der konkaven Zylinderspiegel des ersten Zylinderspiegelarrays vergleichsweise weit von der Ebene des ersten Zylinderspiegelarrays entfernt sein. Weiterhin können auch die konkaven Zylinderspiegel des zweiten Zylinderspiegelarrays größer, insbesondere deutlich größer als die konkaven Zylinderspiegel des ersten Zylinderspiegelarrays sein. Weiterhin besteht die Möglichkeit, dass der Abstand des ersten Zylinderspiegelarrays von dem zweiten Zylinderspiegelarray etwa der Brennweite der konvexen Zylinderspiegel des zweiten Zylinderspiegelarrays entspricht. Weiterhin können auch dritte und/oder vierte Zylinderspiegelarrays vorhanden sein, die Zylinderspiegel mit Zylinderachsen aufweisen, die senkrecht zu den Zylinderachsen der Zylinderspiegel des ersten und des zweiten Zylinderspiegelarrays ausgerichtet sind. In particular, there is the possibility that the device according to claim 16 is further developed by corresponding features that have been set forth in claims 2 to 15 for the cylindrical lens arrays. In particular, therefore, the focal points of the concave cylindrical mirrors of the first cylindrical mirror array can be comparatively far removed from the plane of the first cylindrical mirror array. Furthermore, the concave cylindrical mirror of the second cylindrical mirror array can be larger, in particular significantly larger than the concave cylindrical mirror of the first cylindrical mirror array. Furthermore, there is the possibility that the distance of the first cylindrical mirror array from the second cylindrical mirror array corresponds approximately to the focal length of the convex cylindrical mirror of the second cylindrical mirror array. Furthermore, third and / or fourth cylindrical mirror arrays may also be present Cylindrical mirror having cylinder axes, which are aligned perpendicular to the cylinder axes of the cylinder mirror of the first and second cylindrical mirror array.
Weitere Merkmale und Vorteile der vorliegenden Erfindung werden deutlich anhand der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die beiliegenden Abbildungen. Darin zeigenFurther features and advantages of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. Show in it
Fig. 1 schematisch das Arbeitsprinzip einer Vorrichtung zur Homogenisierung von Licht;Fig. 1 shows schematically the working principle of a device for the homogenization of light;
Fig. 2 eine schematische Seitenansicht einer Vorrichtung zur Homogenisierung gemäß dem Stand der Technik;Fig. 2 is a schematic side view of a device for homogenization according to the prior art;
Fig. 3 eine schematische Ansicht einer Lichtverteilung in einer Arbeitsebene, die durch eine Vorrichtung zur Homogenisierung gemäß Fig. 2 erzeugt wird;3 is a schematic view of a light distribution in a working plane, which is produced by a device for homogenization according to FIG. 2;
Fig. 4 schematisch einen Ausschnitt einer ersten Ausführungsform einer erfindungsgemäßen Vorrichtung;4 shows schematically a detail of a first embodiment of a device according to the invention;
Fig. 5 schematisch einen Ausschnitt aus einer zweitenFig. 5 shows schematically a section of a second
Ausführungsform einer erfindungsgemäßen Vorrichtung.Embodiment of a device according to the invention.
In Fig. 4 und in Fig. 5 sind zur Verdeutlichung kartesische Koordinatensysteme eingezeichnet.In Fig. 4 and in Fig. 5 Cartesian coordinate systems are shown for clarity.
Die aus Fig. 4 ersichtliche erste Ausführungsform einer erfindungsgemäßen Vorrichtung umfasst ein erstes Substrat 15 und ein zweites Substrat 16. Das erste Substrat 15 weist auf seiner Eintrittsfläche ein erstes Zylinderlinsenarray 17 auf, wohingegen die Austrittsfläche plan gestaltet ist. Alternativ dazu besteht auch die Möglichkeit, die Austrittsfläche ebenfalls mit einem Zylinderlinsenarray zu versehen, das beispielsweise gekreuzt zu dem ersten Zylinderlinsenarray 17 ausgerichtet ist. Das erste Zylinderlinsenarray 17 weist konvexe Zylinderlinsen 18 und konkave Zylinderlinsen 19 auf, die abwechselnd nebeneinander angeordnet sind. In dem in Fig. 4 abgebildeten Ausführungsbeispiel sind nur zwei konkave Zylinderlinsen 19 und eine konvexe Zylinderlinse 18 angedeutet. Es können beziehungsweise sollen jedoch in X-Richtung nebeneinander eine Vielzahl von konvexen und konkaven Zylinderlinsen 18, 19 nebeneinander angeordnet sein. Die konkaven Zylinderlinsen 19 sind in X-Richtung, das heißt in der Richtung, in der die Zylinderlinsen 18, 19 nebeneinander angeordnet sind, deutlich weniger ausgedehnt als die konvexen Zylinderlinsen 18.The first embodiment of a device according to the invention shown in FIG. 4 comprises a first substrate 15 and a second substrate 16. The first substrate 15 has on its entrance surface a first cylindrical lens array 17, whereas the exit surface is flat. Alternatively, it is also possible to provide the exit surface also with a cylindrical lens array, which is aligned, for example, crossed to the first cylindrical lens array 17. The first Cylindrical lens array 17 has convex cylindrical lenses 18 and concave cylindrical lenses 19, which are arranged alternately side by side. In the embodiment shown in Fig. 4, only two concave cylindrical lenses 19 and a convex cylindrical lens 18 are indicated. However, a multiplicity of convex and concave cylindrical lenses 18, 19 can be arranged side by side in the X direction next to each other. The concave cylindrical lenses 19 are in the X direction, that is, in the direction in which the cylindrical lenses 18, 19 are arranged side by side, significantly less expanded than the convex cylindrical lenses 18th
Das zweite Substrat 16 weist auf seiner Eintrittsfläche, das heißt auf seiner dem ersten Substrat 15 zugewandten Seite ein zweites Zylinderlinsenarray 20 mit konvexen Zylinderlinsen 21 und konkaven Zylinderlinsen 22 auf. Die konvexen und konkaven Zylinderlinsen 21 , 22 sind in X-Richtung abwechselnd nebeneinander angeordnet, wobei hier ebenfalls eine Vielzahl von konvexen und konkaven Zylinderlinsen 21 , 22 auf der Eintrittsfläche des Substrates 16 vorgesehen sein können. Aus Fig. 4 ist weiterhin ersichtlich, dass sowohl die Zylinderachsen der Zylinderlinsen 18, 19 des ersten Zylinderlinsenarrays 17 als auch die Zylinderachsen der konvexen und konkaven Zylinderlinsen 21 , 22 des zweiten Zylinderlinsenarrays 20 in Y-Richtung, das heißt in einer Richtung senkrecht zu der Richtung X, in der die Zylinderlinsen 18, 19, 21 , 22 nebeneinander angeordnet sind, ausgerichtet sind. Die Austrittsfläche des zweiten Substrates 16 ist ebenfalls plan gestaltet. Alternativ könnte auch die Austrittsfläche des zweiten Substrates 16 ebenfalls mit einem weiteren Zylinderlinsenarray versehen sein, bei dem die Zylinderachsen der Zylinderlinsen senkrecht zu den Zylinderachsen der Zylinderlinsen 21 , 22 des zweiten Zylinderlinsenarrays 20 ausgerichtet sein könnten. Aus Fig. 4 ist ersichtlich, dass die konkaven Zylinderlinsen 22 des zweiten Zylinderlinsenarrays 20 in X-Richtung, das heißt in der Richtung, in der die Zylinderlinsen 18, 19, 21 , 22 nebeneinander angeordnet sind, deutlich größer sind als die konkaven Zylinderlinsen 19 des ersten Zylinderlinsenarrays 17. Insbesondere sind die konkaven Zylinderlinsen 22 des zweiten Zylinderlinsenarrays 20 in diesem Ausführungsbeispiel etwa doppelt so breit wie die konkaven Zylinderlinsen 19 des ersten Zylinderlinsenarrays 17.The second substrate 16 has on its entrance surface, that is to say on its side facing the first substrate 15, a second cylindrical lens array 20 with convex cylindrical lenses 21 and concave cylindrical lenses 22. The convex and concave cylindrical lenses 21, 22 are arranged alternately next to one another in the X direction, whereby a multiplicity of convex and concave cylindrical lenses 21, 22 can likewise be provided on the entry surface of the substrate 16. From Fig. 4 it is further apparent that both the cylinder axes of the cylindrical lenses 18, 19 of the first cylindrical lens array 17 and the cylinder axes of the convex and concave cylindrical lenses 21, 22 of the second cylindrical lens array 20 in the Y direction, that is in a direction perpendicular to the Direction X, in which the cylindrical lenses 18, 19, 21, 22 are arranged side by side, are aligned. The exit surface of the second substrate 16 is also designed plan. Alternatively, the exit surface of the second substrate 16 could also be provided with a further cylindrical lens array, in which the cylinder axes of the cylindrical lenses could be aligned perpendicular to the cylinder axes of the cylindrical lenses 21, 22 of the second cylindrical lens array 20. From FIG. 4 it can be seen that the concave cylindrical lenses 22 of the second cylindrical lens array 20 in the X direction, ie in the direction in which the cylindrical lenses 18, 19, 21, 22 are arranged next to one another, are significantly larger than the concave cylindrical lenses 19 In particular, the concave cylindrical lenses 22 of the second cylindrical lens array 20 in this exemplary embodiment are approximately twice as wide as the concave cylindrical lenses 19 of the first cylindrical lens array 17.
In Fig. 4 sind weiterhin Teilstrahlen 23, 24 des zu homogenisierenden Lichtes 25 eingezeichnet, die durch die konkaven Zylinderlinsen 19 des ersten Zylinderlinsenarrays 17 hindurchtreten. Im Gegensatz zu den Teilstrahlen 1 1 , 12 gemäß dem Stand der Technik (siehe Fig. 2) treten die Teilstrahlen 23, 24 nicht oder nur zu einem unwesentlichen Anteil durch die konvexen Zylinderlinsen 21 des zweiten Zylinderlinsenarrays 20 hindurch, sondern durch die verbreiterten konkaven Zylinderlinsen 22 des zweiten Zylinderlinsenarrays. Auf diese Weise werden die Teilstrahlen 23, 24 von den konkaven Zylinderlinsen 22 des zweiten Zylinderlinsenarrays 20 derart abgelenkt, dass sie in der Arbeitsebene über einen breiten Bereich, insbesondere über die gesamte Breite des homogenisierten Lichtfeldes verteilt werden. Auf diese Weise werden die aus Fig. 3 ersichtlichen seitlichen Überhöhungen 14 gemäß dem Stand der Technik vermieden.In FIG. 4, partial beams 23, 24 of the light 25 to be homogenized are further drawn, which pass through the concave cylindrical lenses 19 of the first cylindrical lens array 17. In contrast to the partial beams 1 1, 12 according to the prior art (see FIG. 2), the partial beams 23, 24 do not or only to an insignificant extent through the convex cylindrical lenses 21 of the second cylindrical lens array 20, but through the widened concave cylindrical lenses 22 of the second cylindrical lens array. In this way, the partial beams 23, 24 are deflected by the concave cylindrical lenses 22 of the second cylindrical lens array 20 such that they are distributed in the working plane over a wide range, in particular over the entire width of the homogenized light field. In this way, the apparent from Fig. 3 lateral elevations 14 are avoided according to the prior art.
Auch die aus Fig. 5 ersichtliche zweite Ausführungsform einer erfindungsgemäßen Vorrichtung umfasst ein erstes Substrat 26 und ein zweites Substrat 27. Das erste Substrat 26 weist auf seiner Eintrittsfläche ein erstes Zylinderlinsenarray 28 mit konvexen Zylinderlinsen 29 und konkaven Zylinderlinsen 30 auf. Das zweite Substrat 27 weist auf seiner Eintrittsfläche, das heißt auf seiner dem ersten Substrat 26 zugewandten Seite ein zweites Zylinderlinsenarray 31 mit konvexen Zylinderlinsen 32 und konkaven Zylinderlinsen 33 auf. Bei beiden Substraten 26, 27 können nicht nur die abgebildeten Anzahlen von Zylinderlinsen 29, 30, 32, 33 sondern eine Vielzahl von Zylinderlinsen 29, 30, 32, 33 abwechselnd nebeneinander angeordnet sein.The second embodiment of a device according to the invention shown in FIG. 5 also comprises a first substrate 26 and a second substrate 27. The first substrate 26 has on its entrance surface a first cylindrical lens array 28 with convex cylindrical lenses 29 and concave cylindrical lenses 30. The second substrate 27 has on its entrance surface, that is to say on its side facing the first substrate 26, a second cylindrical lens array 31 with convex cylindrical lenses 32 and concave cylindrical lenses 33 on. In both substrates 26, 27, not only the illustrated numbers of cylindrical lenses 29, 30, 32, 33 but a plurality of cylindrical lenses 29, 30, 32, 33 can be arranged alternately next to one another.
Im Gegensatz zu dem Ausführungsbeispiel gemäß Fig. 4 sind bei dem Ausführungsbeispiel gemäß Fig. 5 die konkaven Zylinderlinsen 30 des ersten Zylinderlinsenarrays 28 in X-Richtung, das heißt in der Richtung, in der die Zylinderlinsen 29, 30 abwechselnd nebeneinander angeordnet sind, etwa gleich breit oder gleich ausgedehnt wie die konvexen Zylinderlinsen 29 des ersten Zylinderlinsenarrays 28. Im Gegensatz dazu sind die konkaven Zylinderlinsen 33 des zweiten Zylinderlinsenarrays 31 deutlich kleiner als die konvexen Zylinderlinsen 32 des zweiten Zylinderlinsenarrays 31 .In contrast to the embodiment according to FIG. 4, in the exemplary embodiment according to FIG. 5, the concave cylindrical lenses 30 of the first cylindrical lens array 28 in the X direction, ie in the direction in which the cylindrical lenses 29, 30 are arranged alternately next to one another, are approximately equal In contrast, the concave cylindrical lenses 33 of the second cylindrical lens array 31 are significantly smaller than the convex cylindrical lenses 32 of the second cylindrical lens array 31.
Aufgrund der im Wesentlichen gleichen Breite der konkaven und konvexen Zylinderlinsen 30, 29 des ersten Zylinderlinsenarrays 28 ist die Brennweite f1 k der konkaven Zylinderlinsen 30 des ersten Zylinderlinsenarrays 28 vergleichsweise groß, das heißt insbesondere etwa doppelt so groß wie die Höhe oder die Ausdehnung der konvexen Zylinderlinsen 29 in Ausbreitungsrichtung Z des zu homogenisierenden Lichtes. In Fig. 5 ist weiterhin zur Verdeutlichung die Brennweite hv der konvexen Zylinderlinsen 32 des zweiten Zylinderlinsenarrays 31 eingezeichnet. Fig. 5 lässt sich entnehmen, dass diese Brennweite f2v der konvexen Zylinderlinsen 32 etwa dem Abstand zwischen dem ersten Zylinderlinsenarray 28 und dem zweiten Zylinderlinsenarray 31 entspricht. Aufgrund der vergleichsweise großen Brennweite f1 k der konkaven Zylinderlinsen 30 des ersten Zylinderlinsenarrays 28 wird der in Fig. 5 sehematisch angedeutete virtuelle Brennpunkt 34 der konkaven Zylinderlinsen 30 von den konvexen Zylinderlinsen 32 des zweiten Zylinderlinsenarrays 31 nicht in die Arbeitsebene abgebildet. Dies wird in Fig. 5 durch beispielhaft eingezeichnete Teilstrahlen 35, 36, 37 verdeutlicht.Due to the substantially same width of the concave and convex cylindrical lenses 30, 29 of the first cylindrical lens array 28, the focal length f 1 k of the concave cylindrical lenses 30 of the first cylindrical lens array 28 is comparatively large, that is in particular approximately twice as large as the height or the extent of the convex Cylindrical lenses 29 in the propagation direction Z of the light to be homogenized. In FIG. 5, the focal length hv of the convex cylindrical lenses 32 of the second cylindrical lens array 31 is also shown for clarification. FIG. 5 shows that this focal length f 2v of the convex cylindrical lenses 32 corresponds approximately to the distance between the first cylindrical lens array 28 and the second cylindrical lens array 31. Due to the comparatively large focal length f 1 k of the concave cylindrical lenses 30 of the first cylindrical lens array 28, the virtual focal point 34 of the concave cylindrical lenses 30 of the convex cylindrical lenses 32 of the second cylindrical lens array 31 does not become schematically indicated in FIG. 5 mapped to the work plane. This is illustrated in FIG. 5 by partial beams 35, 36, 37 shown by way of example.
Sowohl bei der Ausführungsform gemäß Fig. 4 als auch bei der Ausführungsform gemäß Fig. 5 fluchten in Ausbreitungsrichtung des zu homogenisierenden Lichtes die Scheitellinien der konvexen Zylinderlinsen 18, 29 des ersten Zylinderlinsenarrays 17, 28 mit den Scheitellinien der konvexen Zylinderlinsen 21 , 32 des zweiten Zylinderlinsenarrays 20, 31 . Weiterhin fluchten auch die Scheitellinien der konkaven Zylinderlinsen 19, 30 des ersten Zylinderlinsenarrays 17, 28 mit den Scheitellinien der konkaven Zylinderlinsen 22, 33 des zweiten Zylinderlinsenarrays 20, 31 . Both in the embodiment according to FIG. 4 and in the embodiment according to FIG. 5, in the propagation direction of the light to be homogenized, the apex lines of the convex cylindrical lenses 18, 29 of the first cylindrical lens array 17, 28 are aligned with the apex lines of the convex cylindrical lenses 21, 32 of the second cylindrical lens array 20, 31. Furthermore, the apex lines of the concave cylindrical lenses 19, 30 of the first cylindrical lens array 17, 28 are aligned with the apex lines of the concave cylindrical lenses 22, 33 of the second cylindrical lens array 20, 31.

Claims

Patentansprüche: claims:
1. Vorrichtung zur Homogenisierung von Licht, umfassend1. A device for the homogenization of light, comprising
ein erstes Zylinderlinsenarray (17, 28), durch das das zu homogenisierende Licht (25) hindurch treten kann, wobei das erste Zylinderlinsenarray (17, 28) konvexe und konkave Zylinderlinsen (18, 19, 29, 30) mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind;a first cylindrical lens array (17, 28) through which the light (25) to be homogenized can pass, wherein the first cylindrical lens array (17, 28) has convex and concave cylindrical lenses (18, 19, 29, 30) with mutually parallel cylinder axes, which are arranged alternately next to each other;
ein zweites Zylinderlinsenarray (20, 31 ), durch das das durch das erste Zylinderlinsenarray (17, 28) hindurch getretene Licht hindurch treten kann, wobei das zweite Zylinderlinsenarray (20, 31 ) konvexe und konkave Zylinderlinsen (21 , 22, 32, 33) mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, und wobei die Zylinderachsen der Zylinderlinsen (21 , 22, 32, 33) des zweiten Zylinderlinsenarrays (20, 31 ) parallel zu den Zylinderachsen der Zylinderlinsen (18, 19, 29, 39) des ersten Zylinderlinsenarrays (17, 28) ausgerichtet sind;a second cylindrical lens array (20, 31) through which the light passed through the first cylindrical lens array (17, 28) can pass, the second cylindrical lens array (20, 31) having convex and concave cylindrical lenses (21, 22, 32, 33) having cylinder axes parallel to each other, which are arranged alternately next to each other, and wherein the cylinder axes of the cylindrical lenses (21, 22, 32, 33) of the second cylindrical lens array (20, 31) parallel to the cylinder axes of the cylindrical lenses (18, 19, 29, 39) the first cylindrical lens array (17, 28) are aligned;
dadurch gekennzeichnet, dass die konkaven Zylinderlinsen (19, 30) des ersten Zylinderlinsenarrays (17, 28) in der Richtung (X), in der die Zylinderlinsen (18, 19, 29, 30) nebeneinander angeordnet sind, eine andere Gestaltung aufweisen als die konkaven Zylinderlinsen (22, 33) des zweiten Zylinderlinsenarrays (20, 31 ) in der Richtung (X), in der die Zylinderlinsen (21 , 22, 32, 33) nebeneinander angeordnet sind. characterized in that the concave cylindrical lenses (19, 30) of the first cylindrical lens array (17, 28) in the direction (X), in which the cylindrical lenses (18, 19, 29, 30) are arranged side by side, have a different design than that concave cylindrical lenses (22, 33) of the second cylindrical lens array (20, 31) in the direction (X) in which the cylindrical lenses (21, 22, 32, 33) are arranged side by side.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die konkaven Zylinderlinsen (19, 30) des ersten Zylinderlinsenarrays (17, 28) in der Richtung (X), in der die Zylinderlinsen (18, 19, 29, 39) nebeneinander angeordnet sind, eine andere Ausdehnung und/oder eine andere Krümmung aufweisen als die konkaven Zylinderlinsen (22, 33) des zweiten Zylinderlinsenarrays (20, 31 ) in der Richtung (X), in der die Zylinderlinsen (21 , 22, 32, 33) nebeneinander angeordnet sind.2. Apparatus according to claim 1, characterized in that the concave cylindrical lenses (19, 30) of the first cylindrical lens array (17, 28) in the direction (X), in which the cylindrical lenses (18, 19, 29, 39) are arranged side by side , have a different extent and / or a different curvature than the concave cylindrical lenses (22, 33) of the second cylindrical lens array (20, 31) in the direction (X), in which the cylindrical lenses (21, 22, 32, 33) arranged side by side are.
3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Scheitellinien der konkaven Zylinderlinsen (19, 30) des ersten Zylinderlinsenarrays (17, 28) in Ausbreitungsrichtung (Z) des zu homogenisierenden Lichtes (25) im Wesentlichen mit den Scheitellinien der konkaven Zylinderlinsen (22, 33) des zweiten Zylinderlinsenarrays (20, 31 ) fluchten.3. Device according to one of claims 1 or 2, characterized in that the apex lines of the concave cylindrical lenses (19, 30) of the first cylindrical lens array (17, 28) in the propagation direction (Z) of the light to be homogenized (25) substantially with the apex lines the concave cylindrical lenses (22, 33) of the second cylindrical lens array (20, 31) are aligned.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Zylinderachsen der Zylinderlinsen (18, 19, 21 , 22, 29, 30, 32, 33) des ersten und/oder des zweiten Zylinderlinsenarrays (17, 20, 28, 31 ) senkrecht zu der Richtung (X) ausgerichtet sind, in der die Zylinderlinsen (18, 19, 21 , 22, 29, 30, 32, 33) nebeneinander angeordnet sind.4. Device according to one of claims 1 to 3, characterized in that the cylinder axes of the cylindrical lenses (18, 19, 21, 22, 29, 30, 32, 33) of the first and / or the second cylindrical lens array (17, 20, 28 , 31) are aligned perpendicular to the direction (X), in which the cylindrical lenses (18, 19, 21, 22, 29, 30, 32, 33) are arranged side by side.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die konkaven Zylinderlinsen (22) des zweiten Zylinderlinsenarrays (20) in der Richtung (X), in der die Zylinderlinsen (18, 19, 21 , 22) nebeneinander angeordnet sind, größer, vorzugsweise wesentlich größer als die konkaven Zylinderlinsen (19) des ersten Zylinderlinsenarrays (17) sind.5. Device according to one of claims 1 to 4, characterized in that the concave cylindrical lenses (22) of the second cylindrical lens array (20) in the direction (X), in which the cylindrical lenses (18, 19, 21, 22) are arranged side by side , larger, preferably substantially larger than the concave cylindrical lenses (19) of the first cylindrical lens array (17).
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die konvexen Zylinderlinsen (18) des ersten Zylinderlinsenarrays (17) in der Richtung (X), in der die Zylinderlinsen (18, 19, 21 , 22) nebeneinander angeordnet sind, größer, insbesondere um ein Mehrfaches größer, als die konkaven Zylinderlinsen (19) des ersten Zylinderlinsenarrays (17) sind.6. Device according to one of claims 1 to 5, characterized in that the convex cylindrical lenses (18) of the first cylindrical lens array (17) in the direction (X), in which the cylindrical lenses (18, 19, 21, 22) are arranged side by side, larger, in particular by a multiple larger than the concave cylindrical lenses (19) of the first cylindrical lens array (17) are.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Brennweite (f2v) der konvexen Zylinderlinsen (21 , 32) des zweiten Zylinderlinsenarrays (20, 31 ) etwa so groß ist wie der Abstand zwischen dem ersten Zylinderlinsenarray (17, 28) und dem zweiten Zylinderlinsenarray (20, 31 ).7. Device according to one of claims 1 to 6, characterized in that the focal length (f 2v ) of the convex cylindrical lenses (21, 32) of the second cylindrical lens array (20, 31) is about as large as the distance between the first cylindrical lens array (17 , 28) and the second cylindrical lens array (20, 31).
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Brennweite (f1 k) der konkaven Zylinderlinsen (30) des ersten Zylinderlinsenarrays (28) größer ist als die Ausdehnung der konvexen Zylinderlinsen (29) des ersten Zylinderlinsenarrays (28) in der Ausbreitungsrichtung (Z) des zu homogenisierenden Lichts (25).8. Device according to one of claims 1 to 7, characterized in that the focal length (f 1 k ) of the concave cylindrical lenses (30) of the first cylindrical lens array (28) is greater than the extent of the convex cylindrical lenses (29) of the first cylindrical lens array (28 ) in the propagation direction (Z) of the light to be homogenized (25).
9. Vorrichtung nach Ansprüche 8, dadurch gekennzeichnet, dass die Brennweite (f-ik) der konkaven Zylinderlinsen (30) des ersten Zylinderlinsenarrays (28) mindestens doppelt so groß ist wie die Ausdehnung der konvexen Zylinderlinsen (29) des ersten Zylinderlinsenarrays in der Ausbreitungsrichtung (Z) des zu homogenisierenden Lichts.9. Device according to claim 8, characterized in that the focal length (f-ik) of the concave cylindrical lenses (30) of the first cylindrical lens array (28) is at least twice as large as the extent of the convex cylindrical lenses (29) of the first cylindrical lens array in the propagation direction (Z) of the light to be homogenized.
10. Vorrichtung nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass die die konkaven Zylinderlinsen (30) des ersten Zylinderlinsenarrays (28) in der Richtung (X), in der die Zylinderlinsen (29, 30) nebeneinander angeordnet sind, etwa die gleiche Ausdehnung aufweisen wie die konvexen Zylinderlinsen (29) des ersten Zylinderlinsenarrays (28) in der Richtung (X), in der die Zylinderlinsen (29, 30) nebeneinander angeordnet sind.10. Device according to one of claims 8 or 9, characterized in that the concave cylindrical lenses (30) of the first cylindrical lens array (28) in the direction (X) in which the cylindrical lenses (29, 30) are arranged side by side, such as have the same extent as the convex cylindrical lenses (29) of the first cylindrical lens array (28) in the Direction (X), in which the cylindrical lenses (29, 30) are arranged side by side.
1 1 . Vorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Brennweite (f-ik) der konkaven Zylinderlinsen (30) des ersten Zylinderlinsenarrays (28) größer ist als die Brennweite der konkaven Zylinderlinsen (33) des zweiten Zylinderlinsenarrays (31 ).1 1. Device according to one of claims 1 to 10, characterized in that the focal length (f-ik) of the concave cylindrical lenses (30) of the first cylindrical lens array (28) is greater than the focal length of the concave cylindrical lenses (33) of the second cylindrical lens array (31).
12. Vorrichtung nach einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, dass die Vorrichtung ein Substrat umfasst, auf dem das erste Zylinderlinsenarray und das zweite Zylinderlinsenarray auf einander gegenüberliegenden Seiten angeordnet sind.12. Device according to one of claims 1 to 1 1, characterized in that the device comprises a substrate on which the first cylindrical lens array and the second cylindrical lens array are arranged on opposite sides.
13. Vorrichtung nach einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, dass die Vorrichtung ein erstes Substrat (15, 26) und ein zweites, von dem ersten unterschiedliches, insbesondere von dem ersten Substrat (15, 26) beabstandetes, Substrat (16, 27) umfasst, wobei das erste Zylinderlinsenarray (17, 28) auf dem ersten Substrat (15, 26) und das zweite Zylinderlinsenarray (20, 31 ) auf dem zweiten Substrat (16, 27) angeordnet sind.13. Device according to one of claims 1 to 1 1, characterized in that the device comprises a first substrate (15, 26) and a second, of the first different, in particular of the first substrate (15, 26) spaced apart, the substrate (16 , 27), wherein the first cylindrical lens array (17, 28) on the first substrate (15, 26) and the second cylindrical lens array (20, 31) on the second substrate (16, 27) are arranged.
14. Vorrichtung nach Ansprüche 13, dadurch gekennzeichnet, dass die Vorrichtung weiterhin ein drittes Zylinderlinsenarray umfasst, das auf der dem ersten Zylinderlinsenarray (17, 28) gegenüberliegenden Seite des ersten Substrats (15, 26) angeordnet ist und konvexe und konkave Zylinderlinsen mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, wobei die Zylinderachsen der Zylinderlinsen (18, 19, 29, 30) des ersten Zylinderlinsenarrays (17, 28) senkrecht zu den Zylinderachsen der Zylinderlinsen des dritten Zylinderlinsenarrays angeordnet sind.14. The device according to claim 13, characterized in that the device further comprises a third cylindrical lens array, which on the first cylindrical lens array (17, 28) opposite side of the first substrate (15, 26) is arranged and convex and concave cylindrical lenses with mutually parallel Cylinder axes which are arranged alternately side by side, wherein the cylinder axes of the cylindrical lenses (18, 19, 29, 30) of the first cylindrical lens array (17, 28) are arranged perpendicular to the cylinder axes of the cylindrical lenses of the third cylindrical lens array.
15. Vorrichtung nach einem der Ansprüche 13 oder 14, dadurch gekennzeichnet, dass die Vorrichtung weiterhin ein viertes Zylinderlinsenarray umfasst, das auf der dem zweiten Zylinderlinsenarray (20, 31 ) gegenüberliegenden Seite des zweiten Substrats (16, 27) angeordnet ist und konvexe und konkave Zylinderlinsen mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, wobei die Zylinderachsen der Zylinderlinsen (21 , 22, 32, 33) des zweiten Zylinderlinsenarrays (20, 31 ) senkrecht zu den Zylinderachsen der Zylinderlinsen des vierten Zylinderlinsenarrays angeordnet sind.15. Device according to one of claims 13 or 14, characterized in that the device further comprises a fourth cylindrical lens array which is arranged on the second cylindrical lens array (20, 31) opposite side of the second substrate (16, 27) and convex and concave Cylindrical lenses having mutually parallel cylinder axes, which are arranged alternately side by side, wherein the cylinder axes of the cylindrical lenses (21, 22, 32, 33) of the second cylindrical lens array (20, 31) are arranged perpendicular to the cylinder axes of the cylindrical lenses of the fourth cylindrical lens array.
16. Vorrichtung zur Homogenisierung von Licht, umfassend16. A device for the homogenization of light, comprising
ein erstes Zylinderspiegelarray, an dem das zu homogenisierende Licht reflektiert werden kann, wobei das erste Zylinderspiegelarray konvexe und konkave Zylinderspiegel mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind;a first cylindrical mirror array on which the light to be homogenized can be reflected, wherein the first cylindrical mirror array has convex and concave cylindrical mirrors with mutually parallel cylinder axes arranged alternately side by side;
ein zweites Zylinderspiegelarray, von dem das von dem ersten Zylinderspiegelarray reflektierte Licht reflektiert werden kann, wobei das zweite Zylinderspiegelarray konvexe und konkave Zylinderspiegel mit zueinander parallelen Zylinderachsen aufweist, die abwechselnd nebeneinander angeordnet sind, und wobei die Zylinderachsen der Zylinderspiegel des zweiten Zylinderspiegelarrays parallel zu den Zylinderachsen der Zylinderspiegel des ersten Zylinderspiegelarrays ausgerichtet sind; dadurch gekennzeichnet, dass die konkaven Zylinderspiegel des ersten Zylinderspiegelarrays in der Richtung, in der die Zylinderspiegel nebeneinander angeordnet sind , eine andere Gestaltung, insbesondere eine andere Ausdehnung und/oder eine andere Krümmung, aufweisen als die konkaven Zylinderspiegel des zweiten Zylinderspiegelarrays in der Richtung, in der die Zylinderspiegel nebeneinander angeordnet sind. a second cylindrical mirror array from which the light reflected from the first cylindrical mirror array can be reflected, the second cylindrical mirror array having convex and concave cylindrical mirrors with cylinder axes parallel to each other alternately juxtaposed, and wherein the cylinder axes of the cylindrical mirrors of the second cylindrical mirror array are parallel to the cylinder axes the cylinder mirrors of the first cylinder mirror array are aligned; characterized in that the concave cylindrical mirrors of the first cylindrical mirror array in the direction in which the cylindrical mirrors are arranged side by side, a different design, in particular a different extent and / or a different curvature than the concave cylindrical mirror of the second cylindrical mirror array in the direction the cylinder mirrors are arranged side by side.
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